Electric reciprocating device.



G. JOHNSTON. 'ELECTRIC RECIPROCATING DEVICE.

APPLICATION FILED APR. 16, 19W.

1,300,277. Patented Apr. 15,1919.

Arm/Mrs ermnmrow aonusron, or RICHMOND, vmemm ELECTRIC BEGIPROCATING DEVICE.

Specification of Letters Patent.

Patented Apr. 15, 1919.

Application filed April 16, 1917. Serial No. 162,458.

To all whom it may concern Be it knownthat I, GRnENHow JOHNSTON, a citizen of the United States, and a resident of Richmond, in the county of Henrico and State of Virginia, have made certain new and useful Improvements in Electric Reciprocating Devices, of which the following is a specification.

My invention relates to improvements in a device for producing reciprocatory motion and it is especially applicable to electric guns, riveting devices, pumps, hammers, etc.

An object of my invention is to provide a reciprocating arm whose movement is cffected by electro-magnetic means, said means serving to draw the arm in one direction, while the. tension device, such as a spring, tends to carry the arm in the opposite direction at the end of the stroke.

A further object of my invention is to provide a device of the type described, in which the tension may be increased or diminished at will, thereby varying the intensity or rapidity of the stroke of the reciprocating arm.

A further object of my invention is to provide a reciprocating device which may be readily controlled so as to reciprocate continuously, or to take one forward and one rear stroke only.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claims.

' My invention is illustrated in the accompanying drawings forming part of this application, of which Figure 1 is a side elevation of the device.

Fig. 2 is a section on the line 22 of Fig. 1.

Fig. 3 is a diagrammatic view of the circuit.

In carrying out my invention, I provide a base portion 1 upon which is mounted a solenoid 2 whose core 3 is pivotally attached by means of a link 4 or in any other suitable manner to the reciprocating arm 5. The latter in this case is a lever of the first class, which is pivotally mounted at 6.

Secured to the base 1 is a switch which consists of a rock arm 7 pivotally mounted at 8 on the bracket 9. The arm may be frictionally held on its pivot so as to stay in any position into which it is turned. One end of the arm 7 is provided with a contact 10 arranged to engage a contact 11 carried by the base. One end of the rock arm 7 is provided with a lug or pin 12 arranged to to be engaged by the lever 5 and the other end has a similar pin 13, also arranged to be engaged by the lever 5.

Secured to the lever 5-at 1 1 is a spring 15 which extends through the frame 1 and which is secured to a handle 16 having a locking segment, 17, and a locking device 18 arranged to cooperate with the same, this.

locking device. being controlled with a spring grip 19.

The battery B is connected with a terminal 20 on one side and with a terminal 20 on the other. A switch S is connected with the terminal 20* and is arranged to engage the terminals 21 and 22. A wire 23 connects the terminal 20 with one of the terminals of the solenoid 2. A wire 24 connects the terminal 22 with the opposite end of the solenoid. A branch wire 25 connects with the wire 24 at 26, and also with the contact 10.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. Normallythe switch S is in the dotted line position shown in Fi 3, this being the neu tral poistion and the circuit being broken. If now it is desired to operate the device, the switch is moved to one of the contacts 21 or 22. When the switch is on the contact 21, then the current will pass from the battery through the wire 23 through the solenoid back by wires 25 through contacts 10 and 11 through switch terminal and switch S and back to battery. The solenoid will draw in its core 3 thereupon moving 7 the lever 5 and stretching the spring.

When the lever reaches the end of its stroke it will engage the pin 12 of the arm 7 and rock the latter so as to break the contacts-lO and 11. The spring 15 having now nothing to oppose it, contracts and throws the lever 5 forwardly. The lever engages the pin 13 thus swinging the arm 7 into position to close the circuit at the contacts 10 and 11. The solenoid in turn will be actuated and the movement of the lever will be repeated indefinitely until the switch S is moved to its neutral position.

If it is desired to give only one throw to the arm or lever, then the switch is placed on the contact 22. In this instance the current through the solenoid will flow through the wire 24; to the contact 22, thus energizing the solenoid and causing the arm to swing in opposition to the spring 15. When the arm is swung as far as it will go, the breaking of the circuit will then permit the spring to throw back the arm. The breaking of the circuit may be done by the movement of the switch or in any other convenient manner. I

Reciprocation of the arm 5 may beutiliZed in any of a number of ways, and in the drawing I have shQXYI arod 30 which is disposed in the guides 31, and which is provided with a slidable connection 32 with the lever 5 so that the rod 30 is reciprocated by the lever. The reciprocation of this rod 30 may be made use of, for instance, in a pump,

or in a riveting device, an electric gun or any other dev ce which depends for 1ts action on the reciprocation of one of its parts.

The leverage of the spring 15 may be varied by shifting it to a diflerent position along the lever 5. To this end the lever is provided with the L-shaped slots 1% which are arranged to receive the loop at the end of the spring. This afi'ords an additional adjustment for controlling the action of the device which is independent of the tension adjusting means already described, and adds to the-effectiveness of the device.

I claim 1. A reciprocating device comprising an arm pivotally mounted on a fixed bracket, an electro-magneti'c device for moving the arminone direction, a constantly acting tension device moving the arm in the opposite direction, when the energizing force of the electro-magnetic device has terminated, means for permitting the adjustment of the leverage of said tension device, means for adjusting the tension of said tension device in any of its shifted positions, means controlled by the movement of the arm for cutting off the current through the electromagnetic device at the end of the movement of the arm in one direction and for turning on the current at the end of the movement in the other direction, said means comprising a rock arm having a. lug at each end arranged to be engaged by the first mentioned'arm, a stationary contact, and a contact carried by one end of said arm and arranged to engage said stationary contact during the movementof the arm.

2A reciprocating device comprising a pivoted arm, an electro-magnetic device for moving the arm in one direction and a constantly acting tension device moving the arm in the opposite direction when the energizing force of the electro-magnetic device has terminated, said tension device comprising a. spring, means carried by the pivoted arm for permitting the adjustment-of the leverage of the spring on the arm, a lever connected to the opposite end of the spring, means for shifting said last named lever and for looking it in its shifted position, a rocker-arm having lugs arranged to be engaged by said pivoted arm at its end to shift the rocker arm and a pair of contacts adapted to be opened and closed by the shifting of the rocker arm.

3. A reciprocating device comprising a pivoted arm, an electro-magnetic device for moving the arm in one direction and a constantly acting tension device for moving the arm in the opposite direction when the energizing force of the electro-magnetic device has terminated, said tension device comprising a spring, means carried by the pivoted arm for permitting the adjustment of the leverage of the spring on the arm, a lever connected to the opposite end of the spring, means for. shifting said last named lever and for looking it in its shifted'position, and a circuit closer adapted to be engaged by one end of said pivoted arm for closing the circuit through the electro-m-agneticdevice when the arm is moved in one direction, and for opening the circuit when it is moved in the other direction.

GREENHOW JOHNSTON. Witnesses:

H. E. BERRY, B. D. PURDIE. 

